How to add if condition within the Where clause :

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How to add if condition within the Where clause :

MVIT

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Points: 748
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June 8, 2012 at 6:08 am

#262073

select * from test a inner join test1 b
on a.id=b.module_id
where a.id=@id
and a.name=@name
if (@age >12)
AND CONVERT(CHAR(8), a.start_dt, 112) <= dbo.fCM_Get_UTC_Date_Str(GetDate(), GetUTCDate())
if (@age <12)
AND CONVERT(CHAR(8), a.start_dt, 112) <= dbo.fCM_Get_UTC_Date_Str_Latest(GetDate(), GetUTCDate())
here it's giving me an error "multi part identifier a.start_dt couldn't be found"
help ???

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Ant-Green SSC Guru Points: 113507 More actions · Answer 1

One option is dynamic sql, much like the below

declare @sql nvarchar(max), @age int, @id int

set @sql = '

select

*

from

test a

inner join

test1 b

on

a.id=b.module_id

where

a.id=@id

and

a.name=@name'

if (@age >12)

set @sql = @sql + ' AND CONVERT(CHAR(8), a.start_dt, 112) <= dbo.fCM_Get_UTC_Date_Str(GetDate(), GetUTCDate())'

if (@age <12)

set @sql = @sql + ' AND CONVERT(CHAR(8), a.start_dt, 112) <= dbo.fCM_Get_UTC_Date_Str_Latest(GetDate(), GetUTCDate())'

select @sql

sp_executesql (@sql)

Edit - change the begining, as there are other solutions

pmadhavapeddi22 SSCertifiable Points: 5306 More actions · Answer 2

You Can try the below query.........

select * from test a inner join test1 b

on a.id=b.module_id

where a.id=@id

and a.name=@name

and (CONVERT(CHAR(8), a.start_dt, 112) <= case when @age>12 then dbo.fCM_Get_UTC_Date_Str(GetDate(), GetUTCDate())

when @age<12 then dbo.fCM_Get_UTC_Date_Str_Latest(GetDate(), GetUTCDate()) end)

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 3

anthony.green (6/8/2012)
Needs to become dynamic sql...

Doesn't need to, but possibly better performance than the alternative:

select * from test a

inner join test1 b

on a.id=b.module_id

where a.id=@id

and a.name=@name

AND CONVERT(CHAR(8), a.start_dt, 112) <= CASE

WHEN @age >12 THEN dbo.fCM_Get_UTC_Date_Str(GetDate(), GetUTCDate())

ELSE dbo.fCM_Get_UTC_Date_Str_Latest(GetDate(), GetUTCDate()) END

Either way, the op should Google "SARGability" to see what CONVERT(CHAR(8), a.start_dt, 112) is going to do to performance.

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

MVIT Right there with Babe Points: 748 More actions · Answer 4

MVIT

Right there with Babe

Points: 748

June 8, 2012 at 6:34 am

#1498684

Thanks !!!